How should children take calcium supplements?

Patient's question:

My little one is 5 days away from turning 4 months old. We started supplementing with calcium at 2 months, and he has been drinking Sanjing Gluconate Calcium and EKXIN. He has been taking half a bottle of Sanjing Gluconate Calcium. I would like to ask, does my child need to increase his calcium intake now? How old can he start drinking a full bottle? Thank you

Doctor's answer:

It's good to let the baby be active outdoors frequently, or you can simply let the baby bask in the sun to ensure their skin is regularly exposed to ultraviolet rays.
After exposure to ultraviolet rays, it can effectively promote the conversion of 7-dehydrocholesterol stored in the skin into vitamin D3 through a photochemical reaction. Sunlight exposure allows the skin to store vitamin D3 for later use, preventing an excess of vitamin D.
When sunbathing, avoid doing so through a glass window, as very little ultraviolet light can penetrate glass. Additionally, try to expose as much skin as possible to increase the synthesis of vitamin D.